State the number of carbon atoms in glyceraldehyde.

Given below are two statements.
Statement $I$ - Lactose on hydrolysis converts into glucose and galactose.
Statement $II$ - Galactose also plays the same role as glucose in respiration.
In the light of the above statements,select the correct option given below:

Which of the following examples does not contain hexose sugar units?

Adenosine diphosphate $(ADP)$ contains how many high-energy phosphate bonds?

What is formed when a large number of monosaccharide units are linked together by glycosidic bonds?

Which is the most important sugar found in animals?